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M.S. Flannery Et Al. Management Approach for Unimpounded Rivers A

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M.S. Flannery Et Al. Management Approach for Unimpounded Rivers A M.S. Flannery et al. Management approach for unimpounded rivers A PERCENT-OF-FLOW APPROACH FOR MANAGING REDUCTIONS OF FRESHWATER INFLOWS FROM UNIMPOUNDED RIVERS TO SOUTHWEST FLORIDA ESTUARIES Michael S. Flannery1 Southwest Florida Water Management District 2379 Broad St. Brooksville, Florida 34604 Tel: 352-796-7211 Fax: 352-797-5806 email:[email protected] Ernst B. Peebles, Ph.D. University of South Florida, College of Marine Science 140 Seventh Ave. S. St. Petersburg, Florida 33701 Tel: 727-553-3983 Fax: 727-553-1189 email: [email protected] Ralph T. Montgomery, Ph.D. PBS&J, Inc. 5300 West Cypress St., Suite 300 Tampa, Florida 33606 Tel: 813-282- 7275 Fax: 813-287-1745 email: [email protected] 1 Corresponding author Flannery, Peebles, and Montgomery; Page 1 ABSTRACT: Based on a series of studies of the freshwater inflow relationships of estuaries in the region, the Southwest Florida Water Management District has implemented a management approach for unimpounded rivers that limits withdrawals to a percentage of streamflow at the time of withdrawal. The natural flow regime of the contributing river is considered to be the baseline for assessing the effects of withdrawals. Development of the percent-of-flow approach has emphasized the interaction of freshwater inflow with the overlap of stationary and dynamic habitat components in tidal river zones of larger estuarine systems. Since the responses of key estuarine characteristics (e.g., isohaline locations, residence times) to freshwater inflow are frequently nonlinear, the approach is designed to prevent impacts to estuarine resources during sensitive low-inflow periods and to allow water supplies to become gradually more available as inflows increase. A high sensitivity to variation at low inflow extends to many zooplankters and fishes that move upstream and downstream in synchrony with inflow. Total numbers of estuarine-resident and estuarine-dependent organisms have been found to decrease during low-inflow periods, including mysids, grass shrimp, and juveniles of the bay anchovy and sand seatrout. The interaction of freshwater inflow with seasonal processes, such as phytoplankton production and the recruitment of fishes to the tidal-river nursery, indicates that withdrawal percentages during the springtime should be most restrictive. Ongoing efforts are oriented toward refining percentage withdrawal limits among seasons and flow ranges to account for shifts in the responsiveness of estuarine processes to reductions in freshwater inflow. Flannery, Peebles, and Montgomery; Page 2 Introduction Stream ecologists have emphasized the importance of natural flow regimes for maintaining the geomorphological and ecological characteristics of rivers (Hill et al. 1991; Richter et al. 1997; Poff et al. 1997). There is also evidence that naturally occurring patterns of freshwater inflow are important for maintaining the structure and productivity of estuarine ecosystems. Suspended sediments transported by periodic pulses of high river discharge are a major factor controlling the geomorphological structure of river deltas and bays (Kennish 1986; Jay and Simenstad 1996; Day et al. 1997). The productivity of coastal fisheries is positively related to freshwater inflow (Browder 1985; Drinkwater 1986; Day et al. 1989), and alterations to inflow regimes have caused dramatic declines and recoveries in fish stocks (Moyle and Leidy 1992; Mann and Lazier 1996; Sinha et al. 1996). Significant relationships have been found between the abundance of estuarine-dependent species and preceding freshwater inflow terms averaged over two- or three-month periods, indicating that the seasonality of inflow can have a significant effect on fish abundance (Browder 1985; Longley 1994). In a similar regard, Wilber and Bass (1998) found that oyster harvests were negatively correlated with the number of low-flow days that occurred two years prior, indicating that alteration of one component of a flow regime can have an effect on a specific stage of an organism=s life history. As ground-water sources reach their sustainable limits in southwest Florida, there is growing emphasis on using rivers for water supply. In contrast to other parts of the United States, many major rivers in Florida are not impounded and have not been used for water supplies in the past (Jue 1989; Fernald and Purdum 1998). Based on a Flannery, Peebles, and Montgomery; Page 3 series of studies of the freshwater inflow relationships of estuaries in the region, the Southwest Florida Water Management District (SWFWMD) has implemented a management approach for unimpounded rivers that limits withdrawals to a percentage of streamflow at the time of withdrawal. This approach considers the natural flow regime of a river to be the baseline for assessing the effects of withdrawals. Trends in various streamflow parameters are evaluated to determine if any components of a river=s flow regime have changed. Estuarine relationships with freshwater inflow are then examined within seasons and flow ranges in order to determine percentage withdrawal limits that do not result in adverse environmental impacts. We review the theoretical and empirical framework on which the percent-of-flow approach is based and describe how it is applied in the water management setting. Analyses supporting this approach have emphasized hydrobiological relationships within tidal river zones of larger estuarine systems in southwest Florida. Representative findings from these tidal rivers are reviewed to illustrate key ecological relationships and applications to the management of freshwater inflow. Hydrologic Setting of the Region West-central Florida contains 14 named rivers and numerous small streams that flow to the Gulf of Mexico. The flow regimes of several rivers north of Tampa Bay are dominated by ground-water discharges from large artesian springs, whereas flows in rivers from just north of Tampa Bay southward (Fig. 1) are dominated by surface runoff (Estevez et al. 1991). The region receives an average of about 1.35 m of rainfall per year, with about 60% of the rainfall occurring from June through September. The Flannery, Peebles, and Montgomery; Page 4 temporal variability of streamflow in spring-fed rivers is typically more subdued than seasonal variations in rainfall, while average monthly flows in rivers dominated by surface runoff exhibit greater seasonal variability than monthly rainfall (Fig. 2). In rivers dominated by surface runoff, low flows occur in April and May when rainfall is low and potential evapotranspiration rates are increasing (Bidlake and Boetcher 1997; Lee and Swancar 1997), whereas peak flows typically occur in August or September when depressional storage is full and water tables are high. The interaction of this seasonal streamflow pattern with estuarine processes forms the hydrobiological setting for managing freshwater inflows in these systems. Detecting Changes in Inflow from Unimpounded Rivers The water supply planning and regulation programs administered by the SWFWMD are designed to maintain the physical structure and ecological characteristics of the region=s unimpounded rivers. Municipal water supplies water are currently obtained from five instream impoundments in southwest Florida (Fig. 1), including major reservoirs on the Hillsborough and Manatee rivers and small, low-head structures that serve as salinity barriers on three smaller streams (Braden River and Shell and Myakkahatchee creeks). Water supplies are also obtained from the Tampa Bypass Canal, which is a regulated flood control waterway that was excavated in the channel of the Palm River. With the exception of the Tampa Bypass Canal, all of these impoundments were constructed before 1965. Since the mid-1970s, the SWFWMD (1992; 2001b) has emphasized the use of alternative water storage methods for the development of water supplies from unimpounded rivers in order to avoid impacts to Flannery, Peebles, and Montgomery; Page 5 riverine systems that can result from impoundment (Petts 1984; Ligon et al. 1995; Collier et al. 1996). Water supply storage from unimpounded rivers has been achieved using offstream reservoirs, which are diked or excavated areas located away from the river channel, and aquifer storage and recovery facilities, in which treated surface waters are pumped into underground aquifers for storage and subsequent retrieval. The initial step for evaluating potential withdrawals (and resulting reductions in freshwater inflow) from an unimpounded river involves the assessment of historical changes in the river=s flow regime. Many factors, such as changes in land use or surface-water/ground-water relations in a river basin, can affect flow regimes in the absence of impoundment or direct withdrawals (Newson 1994; FISRWG 1998). Richter et al. (1996) developed a series of quantifiable indicators of hydrologic alteration that can be used to evaluate trends in different components of a flow regime over time. Another useful technique for evaluating changes in low or high flows is trend analysis of daily flow percentiles within each year (Lins and Slack 1999). Using one or more of these hydrologic indicators, historical streamflow records are evaluated to identify trends in different components of a flow regime or changes in seasonal flows. If changes have occurred, analytical effort is directed toward distinguishing the relative effects of climatic variability and anthropogenic influences, which can occur either as distinct events or as gradual changes
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